Trade Help QB for RB...WHIR

[The LiL GianT]

12 Team PPR League

I currently have Matt Ryan, Big Ben, and Cam Newton...

I'm targeting three teams that don't have a good starting QB

Here is the list of RBs they have......Which RBs should I NOT trade for?
If you want, you could rank these RBs for me too...thanks.

Tim Hightower
Felix Jones
Deangelo Williams
Darren Sproles
Joseph Addai
Marshawn Lynch
Knowshown Moreno
Green-Ellis

Keep in mind I am pretty desperate for RB2....